High severity · published Oct 7, 2025
CVE-2021-22291
EIBPORT Reflected XSS
8.0
CVSS
0.3%
EPSS
No
On KEV
Description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in ABB EIBPORT V3 KNX, ABB EIBPORT V3 KNX GSM.This issue affects EIBPORT V3 KNX: before 3.9.2; EIBPORT V3 KNX GSM: before 3.9.2.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EV
EIBPORT V3 KNX · ABB
before 3.9.2 · source: vendor
EV
EIBPORT V3 KNX GSM · ABB
before 3.9.2 · source: vendor
In the news
VulnerabilityHigh
ABB EIBPORT
View CSAF
Summary
ABB is aware of vulnerabilities in the product versions listed as affected in the advisory. A firmware update is available that resolves these privately reported vulnerabilities in the product versions listed as affected in the advisory. An attacker who successfully exploited these vulnerabilities could access sensitive information stored inside the device and can change the configuration of the device.
The following versions of ABB EIBPORT are affected:
EIBPORT V3 KNX (2CLA963710W1001) <3.9.2
EIBPORT V3 KNX (2CSM256242R2001) <3.9.2
EIBPORT V3 KNX GSM (2CLA963720W1001) <3.9.2
CVSS
Vendor
Equipment
Vulnerabilities
v3 8
ABB
ABB EIBPORT
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Background
Critical Infrastructure Sectors: Critical Manufacturing, Information Technology
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Switzerland
Vulnerabilities
Expand All +
CVE-2021-22291
The vulnerability allows the successful attacker to receive a copy of the session id.
View CVE Details
Affected Products
ABB EIBPORT
Vendor: ABB
Product Version: EIBPORT V3 KNX (2CLA963710W1001) Version <3.9.2, EIBPORT V3 KNX (2CSM256242R2001) Version <3.9.2, EIBPORT V3 KNX GSM (2CLA963720W1001) version < 3.9.2
Product Status: fixed, known_affected
Remediations
Vendor fix ABB recommends t...
May 28, 2026·CISA Advisories
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-22291
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-22291
search.abb.com
https://search.abb.com/library/Download.aspx?DocumentID=9AKK108471A7808&LanguageCode=en&DocumentPartId=pdf&Action=Launch
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